Nippon Kayaku Kabushiki Kaisha

Takao Sunaga

Masataka Nakanishi

Katsuhiko Oshimi

Shigeru Moteki

Sumio Ichimura

This invention provides a modified liquid epoxy resin having a low viscosity and a high performance, which is obtained by reacting a mixture of a bisphenol and a phenol aralkyl resin with an epiholohydrin. The bisphenol is preferable to be bisphenol F and is further preferable to have a bifunctional form purity as detected by gel permeation chromatography at UV 254 nm of not less than 95% by area in view of the fluidity. Moreover, the mixture of bisphenol and the phenol aralkyl resin is preferable to have a ratio of the phenol aralkyl resin of 10-70% by mass.

Modified liquid epoxy resin as well as epoxy resin composition using the same and cured product thereof

A phenol aralkyl type phenolic resin represented by the general formula (1), wherein the total content of the compounds represented by formulae (2) to (4) is 58 to 92% as determined by GPC and the contents of the compounds represented by formulae (2) to (4) as determined by HPLC satisfy the following relationship: 0.60&#x2266;(2a+b)/(2a+2b+2c)&#x2266;0.90 wherein a is the content of the compound of formula (2); b is the content of the compound of formula (3); and c is the content of the compound of formula (4). 

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Tokyo, Japan

Takao Sunaga